Prince Harry reportedly thinks Meghan Markle is "the one".

Prince Harry

Prince Harry

The 33-year-old royal has been romancing the American actress for 16 months, and with rumours of a possible engagement between the pair continuing to heat up, sources now say the flame-haired Prince is sure his girlfriend is the woman of his dreams.

An insider told People magazine: "Harry has made no secret of the fact that he wants to marry her. She is the one."

Things have gotten increasingly more serious between the pair in recent months, with Meghan, 36, reportedly set to quit working on her legal drama 'Suits' in favour of a life in the UK with Harry, where she has also reportedly relocated her pet dogs.

Speaking about her pooches, a source said: "She is very close to those two dogs. She lets them sleep on her bed and they eat only the highest quality organic food.

"She misses them when she is away and will even get someone to FaceTime her with them.

"The fact she's started the process of moving them to England is the clearest hint yet that she sees her future living in London with Harry."

And if rehoming her mutts wasn't sign enough that the pair are nearing an engagement, last month saw Meghan invited to Buckingham Palace for tea with Queen Elizabeth, who is Prince Harry's grandmother.

One source said of the meeting: "The couple arrived in time for tea at around 5pm. It is the queen's favourite part of the day and she loves it when her grandchildren are able to join her. She normally sits for half an hour eating from a selection of sandwiches, fruit or plain scones and cake. It is served with her own blend of Darjeeling and Assam tea, known as Queen Mary's blend."

Meghan is certainly making a good impression on Harry's family as it's thought his father Prince Charles was "very impressed" when he met her earlier this year.

And Charles' wife the Duchess of Cornwall - who he married in 2005 - reportedly told a member of staff that the brunette beauty was a "very nice girl and very pleasant."